Monty Python live London show being broadcast worldwide to theaters all over on July 20, 2:30 ET. Check local showings.
Monty Python Live (mostly)
BROADCAST LIVE FROM LONDONS O2
A special live event in cinemas nationwide
http://www.fathomevents.com/event/monty-python-live-mostly/more-info/theater-locations
Also shows in theaters ( not live ) on the 23rd and 24th of July. My local showings are both dates at 7:30 ET.
Fandango gives the July 20 show as costing $18.